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서재호 圓光大學校 1990 論文集 Vol.24 No.2
In this paper, a new method of reducing harmonics that involved input ac line currents on it output dc voltage of the converter system is presented, which is due mainly to the equipment of 2-5 switching taps on interphase reactor. Therefore, the originality of this paper lies in microprocessor based equipment of the 2-5 switching taps on interphase reactor. I applied this method to the 12 pulse converter, and proved validity of that theoretically and experimentally. I propose a furthermore improved method, in which I employ an switching taps circuit constructed with only thyristors in the circuit of interphase reactor. Therefore, main contents of this study are the following two items; 1) Optimum value of turn ratio of interphase reactor. 2) Optimum value of control angle of switching taps. However, in case that the 5tap method is applicable to above optimum conditions, it could not bring to an effect of reducing hamonics under firing angle 15。. At present I can conclude that the converter must be constructed switching taps circuit and must be controlled 2-5 tap changing method.
徐在鎬,尹良雄 圓光大學校 1981 論文集 Vol.15 No.1
The more the transmission voltage goes up in the high voltage insulation, the more the phenomenon of the surface corona comes out. And in the system of the transmitting electric power, the loss of the space-corona has been considered, and there can be the loss by the surface-corona. We can not ignore the loss, and there was no still the evident examination and study about it. Now, in the space-corona brought by the over head transmitting cable(line), we have used Peeks sguare low(V-Vo)². The purpose of this study is three, one is undertaken in other to search for the relations between the Peeks sguarelaw(V-Vo)² and the loss of the surface-corona, another is to observe the experiment in relation of the dielectric Kinds, a third is in the surface of the dielectrics coated with sillicon oil, or not. By the result of this experiment, I can find that the loss of the surface-corona is like Peek's sguare law(V-Vo)²
Thyristor Bridge에 의한 單相 力率 調整에 關한 硏究
徐在鎬 大田工業專門學校 1977 論文集 Vol.21 No.-
This paper treated a method of power factor adjustment using a single phase thyristor bridge. Sufficiently large Reactor is connected to the cutput of the bridge and a method is presented to change the power factor of the input of a bridge by varying the controll angle α and β. The above mentioned theory ver??ed through experiment.
消化性潰瘍의 手術前後 胃酸度 및 胃 Pepsin値의 變動
徐在皓 고려대학교 의과대학 1966 고려대 의대 잡지 Vol.3 No.1
The problem of peptic ulcer therapy is not the relief of symptoms, but the prevention of recurrent ulceration and complications. The main objective of surgical treatment is to reduce the acid secretion of the gastric mucosa. Therefore, the observation of hydrochloric acid and pepsin in gastric juice before and after operations for the purpose of studying surgical treatment of peptic ulcer with different operative choice, is being studied on our department from both physiochemical and clinical standpoints including roentgenologic studies with 28 patients of peptic ulcer ranging from 18 to 66 of ages in both female and male. In this paper we give the results of 1) Billroth Ⅱ type subtotal gastrectomy, 2) antrectomy with vagotomy, and 3) Billroth Ⅱ type subtotal gastrectomy with vagotomy on gastric acid secretion and gastric pepsin. 1) Effect of Billroth Ⅱ subtotal gastrectomy on acid secretion and gastric pepsin is a considerable reduction. Preoperative mean is 57.36±21.81 in gastric acid and 1774.07±740.59 in gastric pepsin. Postoperative mean is 3.03±1.36 in gastric acid and 1557.29±654.31 in gastric pepsin. The mean reduction for the 8 subjects was 94.56 per cent in gastric acid secretion and 12.40 per cent in gastric pepsin. 2) The results for antrectomy with vagotomy was observed. Each mean of gastric acid and gastric pepsin is 52.28±9.73, 1571.86±306.45 in preoperative and 2.78±1.93, 1370.62±256.24 in postoperative. A substantial mean reduction in 5 patients was 95.2 per cent of acid secretion and 13.5 per cent of gastric pepsin. 3) Billroth Ⅱ type subtotal gastrectomy with vagotomy results in a very marked reduction of acid secretion in these patients. Preoperative mean is 50.95±16.05 in gastric acid and 1476.17±657.75 in gastric pepsin. Postoperative mean is 1.875±1.91 in gastric acid and 1242.16±524.30 in gastric pepsin. The mean reduction in 12 cases was 96.22 per cent of gastric acid secretion and 15.00 per cent of gastric pepsin. In these results, we submit the Billroth Ⅱ type subtotal gastrectomy with vagotomy reduces most effectively the level of the gastric acid secretion and gastric pepsin for the peptic ulcer surgery.
徐在鎬,李義承 원광대학교 생산 및 자동화기술연구소 1995 생산.자동화기술연구소논문집 : 원광대 Vol.- No.2
The three phase current - fed inverter discussed by phillips and Maags is becoming increaingly popular for reversible speed induction motor drive application This paper gives the designs of such an inverter for inductive loads, also the commutation analaysis of the R-L load required for the design of the three phase current-fed inverter. Experimental results have been compared with analaytical results.